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Worksheet 517 · Skill 6

Course to steer

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  1. You are at 312°T, 3.4 nm from Tern Island tower, bound for Red nun "2". Your speed through the water is 8.3 kn. The current sets 251°T at 0.9 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  2. You are at 035°T, 1.4 nm from Gannet Rock daybeacon, bound for Green can "1". Your speed through the water is 6.6 kn. The current sets 168°T at 0.7 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  3. You are at 319°T, 3.3 nm from Tern Island tower, bound for Red nun "2". Your speed through the water is 5.0 kn. The current sets 239°T at 0.8 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  4. You are at 006°T, 3.2 nm from Mill stack, bound for Green can "1". Your speed through the water is 5.2 kn. The current sets 228°T at 2.3 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  5. You are at 023°T, 2.6 nm from Mill stack, bound for Green can "3". Your speed through the water is 6.4 kn. The current sets 044°T at 2.4 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  6. You are at 117°T, 1.1 nm from Westfield church spire, bound for Green can "1". Your speed through the water is 11.5 kn. The current sets 194°T at 1.8 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  7. You are at 248°T, 1.9 nm from Tern Island tower, bound for Green can "1". Your speed through the water is 7.2 kn. The current sets 270°T at 2.0 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

  8. You are at 184°T, 1.5 nm from Gannet Rock daybeacon, bound for Green can "3". Your speed through the water is 11.6 kn. The current sets 241°T at 1.2 kn.

    Find the true course to steer that keeps you on the straight track to the buoy, your speed over the ground, and how many minutes it will take.

    Tolerance: 3° (the track is measured on the chart), 0.3 kn and 3 minutes (or 5 %).

    Course to steer: ________ °T   Speed over the ground: ________ kn   Time to the mark: ________ min  

Practice Sheet No. 1

Practice Sheet No. 1 with the starting fixes of this worksheet 34 41 22 38 29 18 27 44 12 21 19 N VAR 7°W (invented) Heron Sound Heron Point Tern Island Westfield Kittle Gannet Rock Fl W 4s 52ft 14M TR TANK SPIRE STACK Dbn 1 2 3 HS 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Border scale: nautical miles (1 nm = 10 ticks) PRACTICE SHEET No. 1 · HERON SOUNDInvented for practice · NOT FOR NAVIGATION · Plotroom Start Start Start Start Start Start Start Start

Answer key

No.AnswersProblem
1Course to steer: 180 °T
Speed over the ground: 8.6 kn
Time to the mark: 33 min
No. 517001 (worked solution)
2Course to steer: 260 °T
Speed over the ground: 6.6 kn
Time to the mark: 59 min
No. 517002 (worked solution)
3Course to steer: 183 °T
Speed over the ground: 5.5 kn
Time to the mark: 55 min
No. 517003 (worked solution)
4Course to steer: 284 °T
Speed over the ground: 6.8 kn
Time to the mark: 19 min
No. 517004 (worked solution)
5Course to steer: 317 °T
Speed over the ground: 7.0 kn
Time to the mark: 21 min
No. 517005 (worked solution)
6Course to steer: 110 °T
Speed over the ground: 11.8 kn
Time to the mark: 16 min
No. 517006 (worked solution)
7Course to steer: 205 °T
Speed over the ground: 8.2 kn
Time to the mark: 22 min
No. 517007 (worked solution)
8Course to steer: 311 °T
Speed over the ground: 12.1 kn
Time to the mark: 21 min
No. 517008 (worked solution)